I can't listen on a ServerSocket! Any help?

Hi,
I'm trying to write an applet that can talk to another applet over the internet. I create a line like this...
serverListen = new ServerSocket(1555);
so I'm listening on port 1555, but since I am doing this over the internet and not on a network, do I still have to worry about ports?
My problem is that everytime I run into the try/catch statement, I always get the catch statement and I can never open a socket. I have uploaded the applet and everything else I need onto anglefire.com (a free hosting service) and I still get the error.
Any advice?
thanks

I would suspect you're running into Applet security issues although you're not giving much to go on here.

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